StacksVerified U.S. regulatory reference

40 CFR Part 265, Appendix I

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov

The recordkeeping provisions of § 265.73 specify that an owner or operator must keep a written operating record at his facility. This appendix provides additional instructions for keeping portions of the operating record. See § 265.73(b) for additional recordkeeping requirements.

The following information must be recorded, as it becomes available, and maintained in the operating record until closure of the facility in the following manner:

Records of each hazardous waste received, treated, stored, or disposed of at the facility which include the following:

(1) A description by its common name and the EPA Hazardous Waste Number(s) from part 261 of this chapter which apply to the waste. The waste description also must include the waste's physical form, i.e., liquid, sludge, solid, or contained gas. If the waste is not listed in part 261, subpart D, of this chapter, the description also must include the process that produced it (for example, solid filter cake from production of ______, EPA Hazardous Waste Number W051).

Each hazardous waste listed in part 261, subpart D, of this chapter, and each hazardous waste characteristic defined in part 261, subpart C, of this chapter, has a four-digit EPA Hazardous Waste Number assigned to it. This number must be used for recordkeeping and reporting purposes. Where a hazardous waste contains more than one listed hazardous waste, or where more than one hazardous waste characteristic applies to the waste, the waste description must include all applicable EPA Hazardous Waste Numbers.

(2) The estimated or manifest-reported weight, or volume and density, where applicable, in one of the units of measure specified in Table 1; and

Unit of measureCode 1
GallonsG
Gallons per HourE
Gallons per DayU
LitersL
Liters Per HourH
Liters Per DayV
Short Tons Per HourD
Metric Tons Per HourW
Short Tons Per DayN
Metric Tons Per DayS
Pounds Per HourJ
Kilograms Per HourR
Cubic YardsY
Cubic MetersC
AcresB
Acre-feetA
HectaresQ
Hectare-meterF
Btu's per HourI
PoundsP
Short tonsT
KilogramsK
TonsM

1 Single digit symbols are used here for data processing purposes.

(3) The method(s) (by handling code(s) as specified in Table 2) and date(s) of treatment, storage, or disposal.

Enter the handling code(s) listed below that most closely represents the technique(s) used at the facility to treat, store or dispose of each quantity of hazardous waste received.

(1) Separation of components

(2) Removal of Specific Components

(d) Biological Treatment

(e) Boilers and Industrial Furnaces

[45 FR 33232, May 19, 1980, as amended at 59 FR 13892, Mar. 24, 1994; 71 FR 40276, July 14, 2006]